我遇到安装mongoose的问题，我试图用命令安装它：
npm install mongoose
它给了我这个错误
npm : The term 'npm' is not recognized as the name of a cmdlet,function, script file, or operable program. Check the spelling of the name, or if a path was included, verify that the path is correct and try again.At line:1 char:1+ npm install mongoose+ ~~~+ CategoryInfo : ObjectNotFound: (npm:String) [], CommandNotFoundException
+ FullyQualifiedErrorId : CommandNotFoundException